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17.9-3.5u=-13.8u-9.91
We move all terms to the left:
17.9-3.5u-(-13.8u-9.91)=0
We get rid of parentheses
-3.5u+13.8u+9.91+17.9=0
We add all the numbers together, and all the variables
10.3u+27.81=0
We move all terms containing u to the left, all other terms to the right
10.3u=-27.81
u=-27.81/10.3
u=-2+5.9586776859504/8.5123966942149
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